scripts/qemu-binfmt-conf.sh

   1 #!/bin/sh
   2 # enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390/HPPA
   3 # program execution by the kernel
   4
   5 qemu_target_list="i386 i486 alpha arm armeb sparc32plus ppc ppc64 ppc64le m68k \
   6 mips mipsel mipsn32 mipsn32el mips64 mips64el \
   7 sh4 sh4eb s390x aarch64 aarch64_be hppa"
   8
   9 i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
  10 i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  11 i386_family=i386
  12
  13 i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
  14 i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  15 i486_family=i386
  16
  17 alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
  18 alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  19 alpha_family=alpha
  20
  21 arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
  22 arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  23 arm_family=arm
  24
  25 armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
  26 armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  27 armeb_family=armeb
  28
  29 sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
  30 sparc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  31 sparc_family=sparc
  32
  33 sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
  34 sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  35 sparc32plus_family=sparc
  36
  37 ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
  38 ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  39 ppc_family=ppc
  40
  41 ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
  42 ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  43 ppc64_family=ppc
  44
  45 ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
  46 ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
  47 ppc64le_family=ppcle
  48
  49 m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
  50 m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  51 m68k_family=m68k
  52
  53 # FIXME: We could use the other endianness on a MIPS host.
  54
  55 mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
  56 mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  57 mips_family=mips
  58
  59 mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
  60 mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  61 mipsel_family=mips
  62
  63 mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
  64 mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  65 mipsn32_family=mips
  66
  67 mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
  68 mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  69 mipsn32el_family=mips
  70
  71 mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
  72 mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  73 mips64_family=mips
  74
  75 mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
  76 mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  77 mips64el_family=mips
  78
  79 sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
  80 sh4_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  81 sh4_family=sh4
  82
  83 sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
  84 sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  85 sh4eb_family=sh4
  86
  87 s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
  88 s390x_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  89 s390x_family=s390x
  90
  91 aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
  92 aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  93 aarch64_family=arm
  94
  95 aarch64_be_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7'
  96 aarch64_be_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  97 aarch64_be_family=armeb
  98
  99 hppa_magic='\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x0f'
 100 hppa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
 101 hppa_family=hppa
 102
 103 qemu_get_family() {
 104     cpu=${HOST_ARCH:-$(uname -m)}
 105     case "$cpu" in
 106     amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
 107         echo "i386"
 108         ;;
 109     mips*)
 110         echo "mips"
 111         ;;
 112     "Power Macintosh"|ppc64|powerpc|ppc)
 113         echo "ppc"
 114         ;;
 115     ppc64el|ppc64le)
 116         echo "ppcle"
 117         ;;
 118     arm|armel|armhf|arm64|armv[4-9]*l|aarch64)
 119         echo "arm"
 120         ;;
 121     armeb|armv[4-9]*b|aarch64_be)
 122         echo "armeb"
 123         ;;
 124     sparc*)
 125         echo "sparc"
 126         ;;
 127     *)
 128         echo "$cpu"
 129         ;;
 130     esac
 131 }
 132
 133 usage() {
 134     cat <<EOF
 135 Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
 136                            [--help][--credential yes|no][--exportdir PATH]
 137
 138        Configure binfmt_misc to use qemu interpreter
 139
 140        --help:       display this usage
 141        --qemu-path:  set path to qemu interpreter ($QEMU_PATH)
 142        --debian:     don't write into /proc,
 143                      instead generate update-binfmts templates
 144        --systemd:    don't write into /proc,
 145                      instead generate file for systemd-binfmt.service
 146                      for the given CPU
 147        --exportdir:  define where to write configuration files
 148                      (default: $SYSTEMDDIR or $DEBIANDIR)
 149        --credential: if yes, credential and security tokens are
 150                      calculated according to the binary to interpret
 151
 152     To import templates with update-binfmts, use :
 153
 154         sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import qemu-CPU
 155
 156     To remove interpreter, use :
 157
 158         sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
 159
 160     With systemd, binfmt files are loaded by systemd-binfmt.service
 161
 162     The environment variable HOST_ARCH allows to override 'uname' to generate
 163     configuration files for a different architecture than the current one.
 164
 165     where CPU is one of:
 166
 167         $qemu_target_list
 168
 169 EOF
 170 }
 171
 172 qemu_check_access() {
 173     if [ ! -w "$1" ] ; then
 174         echo "ERROR: cannot write to $1" 1>&2
 175         exit 1
 176     fi
 177 }
 178
 179 qemu_check_bintfmt_misc() {
 180     # load the binfmt_misc module
 181     if [ ! -d /proc/sys/fs/binfmt_misc ]; then
 182       if ! /sbin/modprobe binfmt_misc ; then
 183           exit 1
 184       fi
 185     fi
 186     if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
 187       if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
 188           exit 1
 189       fi
 190     fi
 191
 192     qemu_check_access /proc/sys/fs/binfmt_misc/register
 193 }
 194
 195 installed_dpkg() {
 196     dpkg --status "$1" > /dev/null 2>&1
 197 }
 198
 199 qemu_check_debian() {
 200     if [ ! -e /etc/debian_version ] ; then
 201         echo "WARNING: your system is not a Debian based distro" 1>&2
 202     elif ! installed_dpkg binfmt-support ; then
 203         echo "WARNING: package binfmt-support is needed" 1>&2
 204     fi
 205     qemu_check_access "$EXPORTDIR"
 206 }
 207
 208 qemu_check_systemd() {
 209     if ! systemctl -q is-enabled systemd-binfmt.service ; then
 210         echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
 211     fi
 212     qemu_check_access "$EXPORTDIR"
 213 }
 214
 215 qemu_generate_register() {
 216     echo ":qemu-$cpu:M::$magic:$mask:$qemu:$FLAGS"
 217 }
 218
 219 qemu_register_interpreter() {
 220     echo "Setting $qemu as binfmt interpreter for $cpu"
 221     qemu_generate_register > /proc/sys/fs/binfmt_misc/register
 222 }
 223
 224 qemu_generate_systemd() {
 225     echo "Setting $qemu as binfmt interpreter for $cpu for systemd-binfmt.service"
 226     qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
 227 }
 228
 229 qemu_generate_debian() {
 230     cat > "$EXPORTDIR/qemu-$cpu" <<EOF
 231 package qemu-$cpu
 232 interpreter $qemu
 233 magic $magic
 234 mask $mask
 235 EOF
 236     if [ "$FLAGS" = "OC" ] ; then
 237         echo "credentials yes" >> "$EXPORTDIR/qemu-$cpu"
 238     fi
 239 }
 240
 241 qemu_set_binfmts() {
 242     # probe cpu type
 243     host_family=$(qemu_get_family)
 244
 245     # register the interpreter for each cpu except for the native one
 246
 247     for cpu in ${qemu_target_list} ; do
 248         magic=$(eval echo \$${cpu}_magic)
 249         mask=$(eval echo \$${cpu}_mask)
 250         family=$(eval echo \$${cpu}_family)
 251
 252         if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; then
 253             echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
 254             continue
 255         fi
 256
 257         qemu="$QEMU_PATH/qemu-$cpu"
 258         if [ "$cpu" = "i486" ] ; then
 259             qemu="$QEMU_PATH/qemu-i386"
 260         fi
 261
 262         if [ "$host_family" != "$family" ] ; then
 263             $BINFMT_SET
 264         fi
 265     done
 266 }
 267
 268 CHECK=qemu_check_bintfmt_misc
 269 BINFMT_SET=qemu_register_interpreter
 270
 271 SYSTEMDDIR="/etc/binfmt.d"
 272 DEBIANDIR="/usr/share/binfmts"
 273
 274 QEMU_PATH=/usr/local/bin
 275 FLAGS=""
 276
 277 options=$(getopt -o ds:Q:e:hc: -l debian,systemd:,qemu-path:,exportdir:,help,credential: -- "$@")
 278 eval set -- "$options"
 279
 280 while true ; do
 281     case "$1" in
 282     -d|--debian)
 283         CHECK=qemu_check_debian
 284         BINFMT_SET=qemu_generate_debian
 285         EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
 286         ;;
 287     -s|--systemd)
 288         CHECK=qemu_check_systemd
 289         BINFMT_SET=qemu_generate_systemd
 290         EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
 291         shift
 292         # check given cpu is in the supported CPU list
 293         for cpu in ${qemu_target_list} ; do
 294             if [ "$cpu" = "$1" ] ; then
 295                 break
 296             fi
 297         done
 298
 299         if [ "$cpu" = "$1" ] ; then
 300             qemu_target_list="$1"
 301         else
 302             echo "ERROR: unknown CPU \"$1\"" 1>&2
 303             usage
 304             exit 1
 305         fi
 306         ;;
 307     -Q|--qemu-path)
 308         shift
 309         QEMU_PATH="$1"
 310         ;;
 311     -e|--exportdir)
 312         shift
 313         EXPORTDIR="$1"
 314         ;;
 315     -h|--help)
 316         usage
 317         exit 1
 318         ;;
 319     -c|--credential)
 320         shift
 321         if [ "$1" = "yes" ] ; then
 322             FLAGS="OC"
 323         else
 324             FLAGS=""
 325         fi
 326         ;;
 327     *)
 328         break
 329         ;;
 330     esac
 331     shift
 332 done
 333
 334 $CHECK
 335 qemu_set_binfmts